WCSLEN(3P)                 POSIX Programmer's Manual                WCSLEN(3P)

PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       wcslen, wcsnlen -- get length of a fixed-sized wide-character string

SYNOPSIS
       #include <wchar.h>

       size_t wcslen(const wchar_t *ws);
       size_t wcsnlen(const wchar_t *ws, size_t maxlen);

DESCRIPTION
       For wcslen(): The functionality described on this reference page is
       aligned with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This volume of
       POSIX.1-2017 defers to the ISO C standard.

       The wcslen() function shall compute the number of wide-character codes
       in the wide-character string to which ws points, not including the
       terminating null wide-character code.

       The wcsnlen() function shall compute the smaller of the number of wide
       characters in the array to which ws points, not including any
       terminating null wide-character code, and the value of maxlen.  The
       wcsnlen() function shall never examine more than the first maxlen
       characters of the wide-character array pointed to by ws.

RETURN VALUE
       The wcslen() function shall return the length of ws.

       The wcsnlen() function shall return the number of wide characters
       preceding the first null wide-character code in the array to which ws
       points, if ws contains a null wide-character code within the first
       maxlen wide characters; otherwise, it shall return maxlen.

       No return values are reserved to indicate an error.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       strlen()

       The Base Definitions volume of POSIX.1-2017, <wchar.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                           WCSLEN(3P)